Cadmium Substitution - garteur

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GARTEUR LIMITED Type A: Type B: electrical resistance across the complete lap joint electrical resistance between one end of lap joint and the fastener The aim of the work was to determine whether a conducting path could be established through the coated fastener. B.2.3 Coating adhesion B.3 Results A low temperature tensile test method was employed by NLR to determine the adhesion of the coatings to the steel substrate. Details of the test procedure are given in reference [B1]. The tensile specimens used in these tests were tapered to give a gradual plastic strain distribution along the specimen axis as a result of tensile testing. After testing cross sections provided information on the crack density as a function of increasing plastic strain. B.3.1 B.3.1.1 Microstructure and composition Microstructure The microstructures of the eight coatings evaluated are shown in figures B2 and B3. SermeTel CR984/985 The topcoat of the SermeTel CR984/985 is cracked. It can be seen that the SermeTel coating consists of two layers and the outer layer has been burnished to obtain electrical conductivity of the coating. The aluminium particles in the inorganic matrix are visible. The SermeTel coating is not completely dense and shows pores, also along the interface of the two sprayed layers. Electrodeposited zinc-cobalt-iron coatings Figure B2 shows the microstructure of the zinc-cobalt-iron coatings. The passivation layer is cracked and shows some features, which might originate from the passivation process. The cross sections show a columnar microstructure without cracks. Electrodeposited zinc-nickel coatings Some cracks through the coating down to the steel substrate can be seen. Remnants of the grit blasting process using alumina lead to subsurface cracks in the steel. Electrodeposited cadmium coatings The passivation layer is cracked. The cross sections of non-passivated and passivated coatings show different microstructure and the thickness of the non-passivated coating is two to three times the thickness of the passivated coating. Ion vapour deposited aluminium coatings Coatings supplied showed the normal porous structure (figure B3) found with ion vapour deposited coatings. Glass bead peening applied after plating tends to densify the coating Unbalanced magnetron sputtered aluminium magnesium coatings The aluminium coatings produced by unbalanced magnetron sputtering are very dense as indicated by the microgaph in figure B2 obtained using scanning electron microscopy. Electrodeposited aluminium coatings On the examination of cross sections using scanning electron microscopy, the electrodeposited aluminium coatings appear extremely dense as illustrated in figure B3. Page 48 GARTEUR SM/AG17 TP128
GARTEUR LIMITED Samples prepared to show the appearance of the surface after passivation revealed a cracked structure similar to that found after the chromate filming of aluminium alloys. Delta-tone/Delta-seal coatings The optical micrograph in figure B2 shows a microsection prepared from a sample coated with Delta-tone. The microstructure is seen to consist of a matrix containing flakes of zinc typically 3-4μm thick and up to 30μm long. B.3.1.2 Composition The main constituents of the unpassivated coatings are given in table B1 below. For the alloy coatings, it was found that the zinc-nickel alloy contained 10 wt-% nickel whereas the zinc-cobalt-iron alloy contained 0.8 wt-% cobalt and a trace of iron (
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GARTEUR LIMITED This page is intent
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GARTEUR LIMITED Executive summary B
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GARTEUR LIMITED nickel coatings cou
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GARTEUR LIMITED Page 9 Recommendati
Page 12 and 13: GARTEUR LIMITED G.1 Introduction 89
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Page 18 and 19: GARTEUR LIMITED 3 Summary of work p
Page 20 and 21: GARTEUR LIMITED The adhesion of con
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Page 24 and 25: GARTEUR LIMITED Outdoor exposure tr
Page 26 and 27: GARTEUR LIMITED coatings showed an
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Page 30 and 31: GARTEUR LIMITED 5.3 Conclusions The
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Page 36 and 37: GARTEUR LIMITED 11 Tables Coating t
Page 38 and 39: GARTEUR LIMITED Coating Thickness
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Page 44 and 45: GARTEUR LIMITED Coating Potential r
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Page 48 and 49: GARTEUR LIMITED Properties ED Zn-Co
Page 50 and 51: GARTEUR LIMITED Figure 3; Protectio
Page 54 and 55: GARTEUR LIMITED A.2.4 Delta-tone/De
Page 56 and 57: GARTEUR LIMITED A.4 Tables Coating
Page 58 and 59: GARTEUR LIMITED 1 Abrasive blast us
Page 60 and 61: GARTEUR LIMITED 1 Activation bath (
Page 64 and 65: GARTEUR LIMITED B.3.3 Coating Adhes
Page 66 and 67: GARTEUR LIMITED Type A Measurements
Page 68 and 69: GARTEUR LIMITED B.7 Figures Hi - Lo
Page 70 and 71: GARTEUR LIMITED ED Cadmium IVD Alum
Page 72 and 73: GARTEUR LIMITED the salt spray was
Page 74 and 75: GARTEUR LIMITED c) Exposure to 100%
Page 76 and 77: GARTEUR LIMITED [C7] Baldwin K.R.,
Page 78 and 79: GARTEUR LIMITED Coating rust (hours
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Page 82 and 83: GARTEUR LIMITED DBAA DERA NLR NLR B
Page 84 and 85: GARTEUR LIMITED C.7 Figures Figure
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Page 94 and 95: GARTEUR LIMITED E.3 Results and dis
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Page 100 and 101: GARTEUR LIMITED compared with cadmi
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GARTEUR LIMITED Additional data obt
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GARTEUR LIMITED I.7 Tables Coating
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GARTEUR LIMITED I.8 Figures Cadmium
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GARTEUR LIMITED Cadmium coated bolt
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GARTEUR LIMITED cadmium although it
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GARTEUR LIMITED Garteur main coatin
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GARTEUR LIMITED D-28183 Bremen, GER
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Cadmium Substitution - garteur

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